JP2014506315A - Pressure adjustment device with neutral position detector - Google Patents

Abstract

  The present invention relates to a pressure adjusting device (1), and more particularly, to a manual or stepping hydraulic control device for a utility machine. This device comprises an electrical or electronic means (20) for measuring the position occupied by an actuator or push rod having a proportional type sensor including a movable member (21) by movement of the actuator (18) or push rod (7). And a non-contact type detecting means (22) for detecting the position of the movable member (21) attached to the main body (2). The present invention also includes such a pressure regulator (1) for controlling the load increase of the load sensing type, for maintaining the idling speed mode of the heat engine, or for the flow sharing type flow distribution. For non-tilting systems.

Description

  The present invention relates to a pressure regulating device, in particular a manual or pedibulateur control device for utility machines, and a system for controlling the rise in pressure of a “load sensing” type including such a device, a heat engine The present invention relates to an anti-basculement system, such as a system that maintains the idling mode of the system, or a system of flow distribution of the “flow sharing” type.

  These pressure regulators are used in particular to ensure the drive of various hydraulic control functions, such as the setting of the various receiving members that attach these mounted public utility machines to the mechanism.

  Such a hydraulic distributor is well known to those skilled in the art and is disclosed, for example, in French Patent No. 2376978.

The pressure regulator of the type disclosed in the above document is
A main body, at least one adjustment unit mounted on the main body, and an actuator extending along the axial direction (YY) and intended to be driven by an operator;
The main body has at least one upper surface side end opening of the main body and at least one cavity extending between a bottom surface facing the end opening;
The at least one adjustment unit has a push rod extending between a head and a leg and is at least partially in the at least one cavity of the body along an axial direction (XX). The pushrod is housed and arranged to move between a measured equilibrium position and a variable position that is recessed or protruding relative to the equilibrium position;
The actuator has a lateral skirt, and the actuator is pivotable relative to the body facing the top surface of the body to control the mutual movement of the push rod. And the skirt is supported by the head of the push rod, and the axis (YY) of the actuator is in a neutral position together with the axis (XX) of the push rod. A variable angle is formed between a variable position inclined with respect to the neutral position in two opposite directions to the neutral position of the actuator.

  By using these adjustment devices, it is generally possible to control various actuators, for example actuators or specific hydraulic motors, by means of rotational movement of the actuator about two different axes around its neutral position. It is possible to achieve a type of action.

  It is possible to drive two adjustment units with each rotational movement about one of the two axes, one of which is intended to perform a predetermined action and the other is the opposite action. Is intended to perform. For example, one adjustment unit controls the outward movement of the drive rod or the clockwise rotation of the hydraulic motor, and the other adjustment unit controls the backward movement of the actuator rod or the counterclockwise rotation of the hydraulic motor. Control.

  Such a type of pressure regulating device comprising a regulating unit provided with a pressure sensor for transmitting an electrical signal representative of the pressure exerted by the fluid on the wall of the body cavity is in particular US Pat. No. 7,753,078. Known from.

  This pressure regulator is satisfactory in that it provides real-time information about the conditions known about the pressure regulator at the moment when the measurement is performed.

  These information can be used to give an indication of the position of the actuator, in particular its orientation and its inclination, for controlling solenoid valves and the like.

  Nevertheless, a pressure regulator provided with such a sensor requires further machining in the cavity in order to mount the sensor and its associated electronics. Such machining can create additional fluid leakage paths.

  Furthermore, such a form combines both a hydraulic control function and an electronic control function, and forms an electronic control function that depends on the hydraulic control function.

On the one hand, the behavior of a manual or foot-operated hydraulic control device is not linear throughout its push rod travel and includes several different stages.
The first stage is a course morte that corresponds to the emergence of the neutral position of the push rod, at which stage the push rod progression reduces the pressure increase at the output of the adjustment unit. Does not occur.
The second stage corresponds to a saut de regulation, in which the pressure at the output of the regulation unit suddenly increases.
The third stage corresponds to a more linear operation, in which the pressure at the output of the adjustment unit is proportional to the push rod progression of the manual or foot-operated hydraulic control device.

  The second stage is problematic due to the sudden and unexpected increase in pressure at the output of the regulating unit, in particular the hydraulic pressure provided with the pressure regulating device by preventing the movement from becoming heavier and giving it a non-heavy driving operation. This is problematic in non-tilt system applications based on preventing these machine movements from becoming heavier.

  In addition, the second stage may further increase the movement beyond the parameterized alert threshold in a non-tilted system.

  The second stage also leads to a delay in the application of the hydraulic pump load in a pressure rise system controlled by a “load sensing” type distribution valve where the hydraulic circuit stays at low pressure, while manual or foot-operated control The device is in a neutral position, thereby limiting energy loss, in particular fuel, and if the manual or foot-operated control device remains in its neutral position, it only performs a pressure increase in the hydraulic circuit. Is done.

  The second stage also leads to a delay in the system managing the speed of the heat engine when the power consumption is low, with the goal of optimizing energy consumption by making the speed of the heat engine idle.

  French Patent No. 2801350 discloses a manual pressure regulator.

  This device has means for detecting the passage of the actuator beyond its progress in its defunct state, and the detection of the controlled movement is performed before the fluid control functions.

  When this device is used, it is possible to detect the passage of the actuator exceeding the progress in the function stop state in the second operation stage of the manual or stepping type control device.

  This document also describes a drawer in which the passage of the second operating phase of the manual control device is applied to the spring via the action of a push rod, corresponding to its actuator that maintains its progression in the out-of-function state. ) Is detected by movement.

  However, these various systems provide applications for adjustments based on the position of the actuator or push rod, as they simply detect the passage of the device from the first state to the second operating state. is not.

French Patent No. 2376978 US Patent No. 7,753,078 French Patent No. 2801350

  The object of the present invention is to solve all or part of the above-mentioned drawbacks.

  To this end, the present invention is a pressure regulating device of the type described above, wherein the actuator or pushrod has a proportional type sensor that includes a movable member that can be moved by movement of the actuator or pushrod. Electrical or electronic means for measuring the position occupied by the sensor, and detection means for non-contact type detection of the position of the movable member attached to the body, the movable member comprising the push rod It is dependent on movement and is arranged in the cavity of the main body, and the detection means is arranged outside the cavity.

  By using this arrangement, in particular during the passage from the first stage to the second stage, and likewise in the third operating stage and further stages, on the one hand, the hydraulic control of the pressure regulator It is possible to separate the function from the electronic control function, on the other hand, the behavior of a manual or foot-operated hydraulic control device can be expected.

  Such a proportional element makes it possible to detect the position of the actuator or of the push rod during its movement over these progressions or over a significant part.

  Furthermore, this arrangement provides management of the hydraulic phase and adjustment of the priority of movement of the different push rods when the pressure regulator has a plurality of push rods.

  Such a regulator makes it possible to anticipate the load of the hydraulic pump with a pressure rise system controlled by a “load sensing” type distribution valve. A “load sensing” type system means that the system controls the flow rate independent of the load.

  Such a regulator provides a non-flow saturation system that allows the application of a “flow sharing” type device, ie, control of useful flow distribution in a system with several pressure regulators. In such systems of the “flow sharing” type, when the total flow required by the receiver is greater than the total flow that can be provided by the source (eg, a pump), the flow is directed to the entire affected receiver. In order to be able to continue to give, it receives a flow rate that is less than the required flow rate but proportional to the request. Within this range, adjustment of the receiver flow can be achieved directly in response to information about push rod movement.

  According to an embodiment, the movable member has at least one magnet, and the detection means has an electronic element that detects the magnet.

  According to one embodiment, the electrical or electronic means for measuring the position of the actuator comprises a Hall effect sensor.

  According to one embodiment, the pressure regulating device comprises several different operating phases, in each of which the output pressure of the regulating unit is measured according to the position of the actuator or of the push rod, Electrical or electronic means for measuring the position occupied by the actuator or the push rod are arranged to measure the position occupied by the actuator or the push rod over at least part of two operating phases. .

  As an example, the different operating stages are formed by a first stage, which is a stage of progression in a so-called out-of-function state, a second adjusting jump stage, and a third stage defined beyond the adjusting jump. The third stage can in particular be a substantially linear control stage and is preferably the other subsequent stage, in particular corresponding to the end of the progression.

  By using this arrangement, it is possible to take advantage of a range of actuator or pusher specific positions.

  Effectively, the movable member is mounted on an abutment cup that restricts the upward movement of the push rod to its equilibrium position, while the detecting means is a cavity of the body to which the movable member is mounted. Mounted on the side of the body facing the side.

  According to an embodiment, when the actuator is in its neutral position, the movable member is arranged facing the detection means.

  The present invention also includes a pressure regulating device as described above for controlling a “load sensing” type pressure rise, for maintaining a heat engine idling speed mode, or for a “flow sharing” type flow. A non-tilting system, especially for distribution, especially for utility machines.

  Thus, when the device can cause a heavier movement, such a device can block movement before the manual or foot-operated hydraulic controller behavior begins in its second stage.

  In any case, the pressure device according to the present invention will be better understood by the following description with reference to the accompanying drawings shown as non-limiting examples.

FIG. 1 is a diagram showing an embodiment of a pressure adjusting device according to the present invention. FIG. 2 is a first graph showing force or pressure versus push rod progression at the output of the adjustment unit of the pressure regulator. FIG. 3 is a second graph showing the force or pressure at the output of the adjustment unit of the pressure regulator and the progression of the push rod. FIG. 4 is a third graph showing force or pressure versus push rod progression at the output of the adjustment unit of the pressure regulator. FIG. 5 is a fourth graph showing the force or pressure at the output of the adjustment unit of the pressure adjustment device versus the progression of the push rod. FIG. 6 shows the use of the adjusting device according to the invention.

  In the embodiment shown in FIG. 1, the pressure adjusting device 1 is provided between an end opening 4 on the upper surface 2 a side of the main body 2 and a bottom opening 5 on the bottom surface 2 b side facing the end opening 4. It has a body 2 with two cavities 3a, 3b extending.

  The third cavity 3c is arranged to communicate with each of the cavities 3a and 3b through the channel so that only the bottom surface 2b side of the main body 2 is open.

  The third cavity 3c that is open on the bottom surface 2b side of the main body 2 forms an inlet E for pressurized hydraulic fluid, while the other cavity opens to the bottom surface 5 on the bottom surface 2b of the main body. The cavities 2a and 2b form outlets S1 and S2 for the hydraulic fluids that are adjusted and pressurized, respectively.

  A fourth cavity (not shown) in that respect forms a pressurized hydraulic fluid outlet entering the inlet E.

  This cavity is connected to an external hydraulic fluid tank, and is connected to a hydraulic pump that returns the hydraulic fluid pressurized to the inlet E itself.

  Each pressure adjustment device 1 has an actuator 18, for example, a handle of a manual hydraulic control device that rotates and moves around an axis so that two adjustment units 6 mounted on the main body 2 can be driven. Have.

  Each adjustment unit 6 has a push rod 7 extending between the head 8 and the leg 9, and each push rod 7 extends in the two cavities of the main body 2 along the axial direction (XX). Partially housed in one of 3a, 3b, the push rod 7 is arranged to move relative to each other between the measured equilibrium position PE and the enfoncee variable position.

  The invention is not limited to the embodiment with two adjustment units 6, but in particular in a pressure adjustment device 1 with several adjustment units, for example a combination of lateral and vertical rotational movements. It will be appreciated that it may relate to four 2 × 2 devices that are provided.

  The pressure regulating device 1 also has a guide 10 in the form of a hollow cylinder that is crossed on the right side through which the push rod 7 passes, inside the push rod 7 moving with minimal play.

  The guide 10 is fixed at the end opening 4 on the side of the upper part 2a of the main body 2 by means of the cavities 3a and 3b, and a first seal gasket 11 for ensuring a fluid seal inside and outside the guide 10, respectively. And a second seal gasket 12.

  An abutment cup (coupelle butee) 13 is engaged with the leg 8 of the push rod 7 in order to limit the upward movement of the push rod 7.

  The present invention is not limited to this type of abutment cup 13 and may have means for imparting upward movement of the push rod, in particular toward the outside thereof, without departing from the scope of the present invention.

  The leg 8 of the push rod 7 extends relative to the push rod 14 across the abutment cup 13, which is mounted to vibrate substantially along the same axial direction XX as the push rod 7. Arranged to ensure the ability to reduce.

  For this purpose, the plunger 14 is translatable inside a cavity 9 ′ formed at the leg 9 of the push rod 7.

  A return spring 15 is interposed between the bottom surface 5 of each cavity 3 a, 3 b of the main body 2 and the abutment cup 13 engaged with the leg portion 9 of the push rod 7.

  An adjustment spring 15 ′ having a smaller diameter than the return spring 15 and arranged coaxially with the return spring is interposed between the plunger 14 and the abutment cup 13.

  This adjustment spring 15 ′ exerts a restoring force against the pressure exerted on the plunger 14.

  Thus, the equilibrium of the plunger 14 is on the one hand the compression of the return spring 15 imposed by the drive of the push rod 7 and on the other hand the outlet S1 of the pressure regulator 1 acting on the restoring force of the adjustment spring 15 ′, It is determined by the output adjustment pressure transmitted to the downstream receiving member connected to S2.

  Plunger 14 has an active portion 14 'interposed to control fluid pressure at outlets S1, S2.

  For this purpose, the active part 14 ′, in the direction of the outlets S 1, S 2, has an axial blind hole 16 opening in the cavities 3 a, 3 b, respectively, and a position d′ enforcement of the push rod 7. And a transverse orifice 17 arranged to position the various chambers in the cavities 3a, 3b communicating with each other.

  Thus, in the neutral position PN of the push rod 7, the pressurized fluid is directed to the duct provided in the main body 3, and is connected to the low pressure fluid region, for example, an oil tank, at the outlet of the neutral position PN. The pressurized fluid is directed to one of the outlets S1 or S2.

  Control of the drive of the push rod 7 is achieved by an actuator 18 extending along the axial direction YY, which is intended to be driven by an operator, and this actuator also has a lateral skirt 19. Have.

  The actuator 18 is pivotally mounted to the main body 2 facing the upper surface 2a of the main body 2 in order to control the mutual movement of the push rod 7, and the skirt 19 is the head of the push rod 7. The actuator axis YY, together with the axis XX of the push rod 7, corresponds to the neutral position PN of the actuator 18 similar to the measured equilibrium position PE of the push rod 7. A variable angle is formed between the value of 0 ° and the value of less than 90 ° corresponding to the tilt position of the actuator 18, similar to the variable drive or lift position of the push rod 7.

  The pressure adjusting device 1 according to the present invention also has means 20 for measuring the position of the actuator 18 between its neutral position PN and its inclined position.

  These means 20 for measuring the position of the actuator 18 are arranged so as not to interact with the hydraulic control function of the pressure regulator 1.

  These means 20 for measuring the position of the actuator 18 preferably comprise a position sensor of the type utilizing the Hall effect having a movable member 21 and a fixed detection means 22.

  The detection means 22 has an electron detection element or sensor 22a that is arranged in close contact with the movable member 21, and the electronic plate (carte electronique) is a micro that can format a signal from the output of the sensor 22a. In the case of several means 20 for measuring the position of the actuator 18 with respect to the same pressure regulator 1 of a control device or processing device 22b or a manual or stepping type hydraulic control device, there is a combination of these.

  These measuring means are position sensors of the type using the Hall effect. Therefore, a movable member 21 intended to be movable has a magnet 21a, whereas a sensor 22a intended to be fixed relative to the movable member 21 to define a reference system is preferably Has a detection chip 22a that generates a Hall voltage.

  The signal transmitted by the detection chip 22a is determined by the relative distance separating it from the movable member 21 of the detection means 22.

  As shown in FIG. 6, the output signal of the device 22b that processes the signal from the output of the sensor 22a is utilized to drive other electrical or electronic components, such as a solenoid valve 22c.

  By way of example, a solenoid valve is used to provide a circuit pressure adjustment depending on the position of the actuator or push rod, for example to control a device that reduces pressure, by using the device according to the invention. It is possible.

  Thus, it is possible to give a flow distribution to a device with several actuators (flow sharing) or to account for the load on the system (load sensing) adjustment.

  As shown in FIG. 1, the magnet 21 a is disposed in the cavities 3 a and 3 b of the lateral housing 23 formed on the side surface of the abutment cup 13 toward the outside of the pressure adjustment device 1, while the pressure adjustment is performed. When the actuator 18 of the device 1 is in its neutral position PN, the detection means 22, in particular the detection chip 22a, is mounted in a housing 24 formed on the side of the body 2 facing the magnet 21a.

  In this embodiment, only one processing unit 22b can be used to process the entire signal resulting from the entire sensor 22a of the same pressure regulator 1 of a manual or foot-operated type hydraulic controller. .

  In another embodiment not shown, it is possible to design the electronic plate 22b by programming, corresponding to an adjustment jump in which the output pressure S1, S2 of the push rod 7, in particular the adjustment unit 6, suddenly increases. Give the anticipation of the second stage of movement, and these data are non-tilted systems, pressure rising systems controlled by “load sensing” type distribution valves, “flow sharing” type flow distribution systems, or Used by the system to maintain the idling speed mode of the heat engine.

The graphs of FIGS. 2, 3, 4 and 5 can distinguish the three stages shown at the beginning of the behavior of a manual or foot-operated hydraulic controller. That is, these three stages are:
The first stage is a progression in a disabled state corresponding to the maintenance of the neutral position of the push rod, at which stage the progression of the push rod does not cause an increase in pressure at the output of the adjustment unit.
The second stage corresponds to an adjustment jump, in which the pressure at the output of the adjustment unit suddenly increases.
The third stage corresponds to a more linear operation, in which the pressure at the output of the adjustment unit is proportional to the push rod progression of the manual or foot-operated hydraulic control device.

  Nevertheless, the three graphs differ from each other with respect to these third stage slopes, which correspond to more linear motion. The output pressure of the adjusting unit 6 becomes proportional to the progress of the push rod 7 of the manual or stepping type hydraulic control type pressure adjusting device 1, and similarly, the force is processed at the end of the progress of the actuator 18. .

  Thus, FIGS. 3 and 5 show a particular position near the end of travel position of the actuator 18, and the pressure adjustment jumps follow this pressure stability over a range of end of travel positions. This occurs at the output of the adjustment unit 6 of the pressure regulator 1.

  This second adjustment jump results in the abutment of the plunger 14 of the push rod 7 following the compression of the adjustment spring.

  The plunger 14 can then never adjust the pressure, completely opening the lateral orifice 17 between the orifice E whose pressure has been reduced and the associated orifice S1 or S2 whose output has been adjusted.

  4 and 5 also show two different slopes in the third operating phase of the pressure regulator 1.

  This change in the slope is due to the specific treatment of the force due to the advancement of the push rod 7. Therefore, with almost half progress, the force or pressure at the output of the adjustment unit 6 of the pressure regulator 1 increases more rapidly as the push rod 7 progresses.

  While the invention has been described in connection with specific exemplary embodiments, it is to be understood that the invention is not limited thereto but includes technically equivalent ranges and combinations thereof. Will.

Claims (7)

The body (2),
At least one adjustment unit (6) mounted on the body (2);
An actuator (18) extending along the axial direction (Y-Y) and intended to be driven by an operator,
The main body (2) is between an end opening (4) on the side of at least one upper surface (2a) of the main body (2) and a bottom surface (5) facing the end opening (4). Having at least one cavity (3a, 3b) extending;
The at least one adjustment unit (6) has a push rod (7) extending between a head (8) and a leg (9), and the body along the axial direction (XX) The push rod (7) is at least partially housed in the at least one cavity (3a, 3b) of (2), with respect to the measured equilibrium position (PE) and the equilibrium position (PE). It is arranged to move between the recessed or protruding variable position,
The actuator (18) has a lateral skirt (19) and the actuator (18) is adapted to control the mutual movement of the push rod (7). Pivotally mounted to the body (2) facing the upper surface, the skirt (19) being supported by the head (8) of the push rod (7) and the shaft of the actuator (YY) together with the axis (XX) of the push rod, the neutral position (PN) and the actuator (18) in two opposite directions to the neutral position (PN) In a pressure adjustment device (1), in particular a manual or foot-operated hydraulic control device for public works machines, which forms a variable angle with a variable position inclined with respect to the neutral position (PN),
This pressure adjusting device (1)
Electricity to measure the position occupied by the actuator (18) or the push rod (7) having a proportional type sensor including a movable member (21) by movement of the actuator (18) or the push rod (7) or Electronic means (20);
Non-contact type detection means (22) for detecting the position of the movable member (21) that is interdependent with the main body (2),
The movable member (21) is mutually dependent on the movement of the push rod (7) and is disposed in the cavity (3a, 3b) of the main body (2), and the detection means (22) The pressure adjusting device (1) is arranged outside the cavity. The movable member (21) has at least one magnet (21a),
The pressure adjusting device (1) according to claim 1, wherein the detection means (22) includes an electronic element (22a) for detecting the magnet (21a).   The pressure regulator (1) according to claim 2, wherein the electrical or electronic means (20) for measuring the position of the actuator (18) comprises a Hall effect sensor.   It includes several different operating phases, in each of which the output pressure of the adjustment unit (6) is measured according to the position of the actuator or of the push rod, and by means of the actuator (18) or the push rod An electrical or electronic means (20) for measuring the occupied position is arranged to measure the position occupied by the actuator (18) or the push rod over at least part of two operating phases. Item 1. The pressure regulator (1) according to item 1.   The movable member (21) is attached to an abutment cup (13) that restricts the upward movement of the push rod (7) to its equilibrium position (PE), while the detection means (22) 5. The device according to claim 1, wherein the member is mounted on a side surface of the body (2) facing a side surface of the cavity (3 a, 3 b) of the body (2) to which the member (21) is mounted. Pressure regulator (1).   The pressure adjusting device according to any one of claims 1 to 5, wherein when the actuator (18) is in its neutral position (PN), the movable member (21) is arranged facing the detection means (22). (1).   Flow distribution for controlling a load sensing type pressure increase, for maintaining a heat engine idling speed mode, or for a flow sharing type flow distribution, comprising a pressure regulator (1) according to any one of the preceding claims. Non-tilting system for, especially for public works machinery.

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